Brake Bias Questions

[totta Crolla]

If you install a way to adjust brake balance then ideally you need to run the same pads front and rear. If the pads act differently when they change temperature you will be forever chasing your tail adjusting the brake balance.
The only real way to adjust brake balance is with a balance bar pedal box.
You could try same pad front / rear but remove the standard proportioning valve and fit a decent (AP) driver adjustable one in its place. I use this on my rally car and it is a good compromise to a bias pedal box. (Rules don't allow a bias pedal box for me)